Electric-arc lamp.



No. 783,974. PATENTED FEB. 28, 1905.-

OLA. NAGEL.

ELEGTRIG ARC LAMP.

APPLICATION FILED APR.14, 1904.

Witnesses fizl/entor W WWW UNITED STATES Patented February 28, 1905.

PATENT OFFICE.

CHARLES A. N AGEL, OF ALLEGHENY, PENNSYLVANIA, ASSIGNOR OF TIVO- SIXTHSTO IVILLIAM Gr. ANDERSON AND ONE-SIXTH TO MAX E. NA( rEL,

- usually employed in lamps of this class. For

OF ALLEGHENY, PENNSYLVANIA.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 783,974, dated February28, 1905.

Application filed April 14, 1904,. Serial No. 203,167.

To all who/1t it vita/y concern.-

Be itknown thatI, (JirARLEs A. NAeEL,a citizen oi the United States,residing at Allegheny, in the county of Allegheny and State ofPennsylvania, have invented new and useful Improvements in Arc-Lamps, ofwhich the following is a specification.

The object of my invention is to provide a new and improved are-lamp;and to this end my invention consists of a new and improved arc-lamp, inthe novel features of construction, and in the combination of parts, allas fully hereinafter described and claimed.

Among the principal objects of the present invention is to reduce thenumber of parts example, I entirely dispense with the dashpot and theusual magnets.

In the accompanying drawings, which illustrate an application of myinvention, Figure 1 is an elevational view of a lamp constructed inaccordance with my invention, and Fig. 2 a bottom plan of armature andchokecoil.

Referring to the drawings, the frame of the lamp comprises a slottedcarbon-tube 1, a crosspiece 2, base 3, posts 4:, extending upwardly fromthe base and carrying cross-piece 2, and a dependent hanger 5 for thelower carbon. This construction, except perhaps in details, is found inarc-lamps in general use and, it is believed, does not require a furtherdescription.

A choke-coil 6, comprising a core 7, of laminated soft iron, and coils8, of insulated copper wire, taken in connection with armature 9,constitute characteristic and important features of the presentinvention. The core of the choke-coil in my invention is utilized as amagnet for actuating the armature.

The armature is connected to the carboncluteh 10 by means of a jointedrod 11 and spring 12 and moves the upper carbon in the usual manner. The"form of armature preferably employed is particularly shown by Fig. 2and comprises in addition to the plate 9 a strip of soft metal 9. Asillustrated, the armature is hinged to the core 7 of the chokecoil byhinge 13; but instead of connecting the armature directly to thechoke-coil it may be arranged in close proximity thereto. As shown, itis disposed so that one end of the plate 9 is nearer the choke-coil thanthe other and free end. The purpose of this is to have a portion of thearmature so near the core of the choke-coil that it will at once respondto the magnetic attraction of said core. The upward pull is firstexerted upon that portion nearest the choke-coil, and at the start theattraction is not as strong as it is after the remaining portion of thearmature is brought nearer the choke-coil, when the armature has anaccelerated movement. The armature is provided with a spring 14 toprevent vibrations of same against the choke-coil. The plane or planesin which the armature normally lies is or are inclined to the plane ofthe lower portion of the core of the choke-coil. Such a constructiondoes away with the necessity of employing a dash-pot.

The core of the choke-coil, while shown U- shaped, may be of some othersuitable form. In the drawings I have shown the coreformed withinwardly-extending projections 15 and have arranged the armature in sucha manner that the portion 9 of armature will travel in the space betweenthe two projections l5. The means for actuating the armature which inturn moves the carbon may be ditlerent from what is shown withoutdeparting from the scope of my invention, for among the features Idesire to cover as my invention are means for operating an arc-lamp ofthis class without the use of dash-pots. l contemplate the employment ofa magnet for actuating the armature, said armature employed for movingone of the carbons, and the said armature arranged in connection withthe magnet in such a manner as to prevent flickering of are whereby theuse of a dash-pot is dispensed with.

For the purpose of limiting the downward movement of the armature Iprovide a stop 16.

hat I claim is 1. An arclamp having a choke coil provided withinwardly-projecting portions, as

15, an armature connected with the choke-coil and actuated by themagnetism of the chokecoil provided with a strip of soft metal arrangedto travel in the space between the projecting' portions of thechoke-coil, a carbonclutch, means connecting the carbonclutch and thearmature, and a spring carried on the armature, substantially as setforth.

2. An arc-lamp having a choke-coil, an armature actuated by thechokec0il and connected thereto at one end, a spring on the free end ofthe armature adapted to make contact with the choke coil when thearmature is raised, a carbon-clutch, and means connecting thecarbon-clutch and the armature, substantially as set forth.

\VM. (Jr. ANDnnsoN, l\lAX E. Naomi.

